How to run multiple test suites in TestNG?

Suppose we have individual test suite for different features/modules in TestNG, we can run multiple testNG test from a master suite xml file by calling the individual tests as shown below:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE suite SYSTEM "http://testng.org/testng-1.0.dtd" >
<suite name="MainTestSuite">
    <suite-files>
        <suite-file path="suiteFeatureA.xml" />  
        <suite-file path="suiteFeatureB.xml" /> 
        <suite-file path="suiteFeatureC.xml" />  
        <suite-file path="suiteFeatureD.xml" />      
    </suite-files>
</suite>

This way, we can run multiple test suites from a master suite file in TestNG.